package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import com.sun.deploy.net.HttpResponse;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        String fileName=UUID.randomUUID().toString()+suffix;
        File dir=new File(basePath);
        if(!dir.exists()){
            dir.mkdirs();
        }
        //MultipartFile的参数名字要和前端发送请求的name属性一致  file是一个临时文件请求结束就消息 需要转存
        try {
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        FileInputStream inputStream=null;
        ServletOutputStream outputStream=null;
        try {
            inputStream=new FileInputStream(new File(basePath+name));
             outputStream = response.getOutputStream();
             response.setContentType("image/jpeg");
            byte[] bytes=new byte[1024];
            int length=0;
            while((length=inputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,length);
                outputStream.flush();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            try {
                if(inputStream!=null){
                    outputStream.close();
                }
                if(outputStream!=null){
                    outputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

        }


    }

}
